If you would like to see all the products associated to the manufacturer and remove them from your catalog, here is how to proceed.
Display all your products using Catalog > Product List
Select the Large View
Select the name of the manufacturer in the corresponding column
This is it, all the products associated to this manufacturer are now displayed
You can now select them all using the 'select all products' icon on the toolbar
If you now wish to delete them definitively off your store, click on the red cross icon on the toolbar. Beware that this manipulation will delete products permanently.
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